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Synthesis of high-strength W–Ta ultrafine-grain composites

Published online by Cambridge University Press:  31 January 2011

R.T. Ott ,
X.Y. Yang ,
D.E. Guyer ,
S. Chauhan  and
D.J. Sordelet
R.T. Ott*
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
X.Y. Yang
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
D.E. Guyer
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
S. Chauhan
Affiliation:
Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011
D.J. Sordelet
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (United States Department of Energy), Ames, Iowa 50011
*
a)Address all correspondence to this author. e-mail: rtott@ameslab.gov
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Abstract

Bulk samples of an ultrafine-grained tungsten–tantalum composite alloy have been synthesized by consolidating mechanically milled composite powders. The grain growth during densification is limited due to the submicron-scale layering of the individual metals in the composite particles and the relatively low sintering temperature (1300 °C). The ultrafine microstructure of the high-density (∼99% theoretical density) samples leads to a high yield stress of ∼3 GPa under quasi-static uniaxial compression. A tendency for Ta-rich solid-solution formation during densification was observed, and the high-temperature phase equilibria in the composite powders were examined further using high-energy x-ray diffraction at temperatures up to 1300 °C.

Keywords

NanostructurePowder metallurgyW
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 133 - 139
Copyright
Copyright © Materials Research Society 2008

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References

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